Doctrinale
MLA
Alexander, de Villa Dei. Doctrinale. 0AD. https://collections.library.yale.edu/catalog/11403200.
APA, 6th edition
Alexander, de V. D. (0 C.E.). Doctrinale [Coats of arms (AAT), Grammars, Languages (Study discipline), Manuscripts, Marginalia, Poems]. https://collections.library.yale.edu/catalog/11403200.